Nerf rounds are only Antitank 4, meaning they are only going to impact when the E75 assaults and you get some point blank shots into the grounding plate and side armour ... I would suggest the combination of a supersoaker and nerf rounds in a combined long range hose and then nerf penetration attack.

Great idea, great build ... got me thinking...! My Boy would a) love that and is b) nearly 3.